package com.shundr.common.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
import java.util.Timer;
import java.util.TimerTask;

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;

import com.shundr.common.http.CommonRequest;
import com.shundr.frame.constant.LConstants;

/**
 * 
 * CrashHandler UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.
 * 
 * @author larry 2015-4-21 下午3:15:09 
 * @version 1.0.0
 *
 */
public class CrashHandler implements UncaughtExceptionHandler {  
      
    public static final String TAG = "CrashHandler";  
      
    //系统默认的UncaughtException处理类   
    private Thread.UncaughtExceptionHandler mDefaultHandler;  
    //CrashHandler实例  
    private static CrashHandler INSTANCE = new CrashHandler();  
    //程序的Context对象  
    private Context mContext;  
    //用来存储设备信息和异常信息  
    private Map<String, String> infos = new HashMap<String, String>();  
  
    /** 保证只有一个CrashHandler实例 */  
    private CrashHandler() {  
    }  
  
    /** 获取CrashHandler实例 ,单例模式 */  
    public static CrashHandler getInstance() {  
        return INSTANCE;  
    }  
  
    /** 
     * 初始化 
     *  
     * @param context 
     */  
    public void init(Context context) {  
        mContext = context;  
        //获取系统默认的UncaughtException处理器  
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();  
        //设置该CrashHandler为程序的默认处理器  
        Thread.setDefaultUncaughtExceptionHandler(this);  
    }  
  
    /** 
     * 当UncaughtException发生时会转入该函数来处理 
     */  
    @Override  
    public void uncaughtException(Thread thread, Throwable ex) {  
        if (!handleException(ex) && mDefaultHandler != null) {  
            //如果用户没有处理则让系统默认的异常处理器来处理  
            mDefaultHandler.uncaughtException(thread, ex);  
        } else {  
//            restartApplication();
        }  
    }  
  
    /** 
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成. 
     *  
     * @param ex 
     * @return true:如果处理了该异常信息;否则返回false. 
     */  
    private boolean handleException(Throwable ex) {  
        if (ex == null) {  
            return false;  
        }
        
        final String crashReport = getCrashReport(mContext, ex);
		new Thread() {
			public void run() {
				Looper.prepare();
				save2File(crashReport);
				sendAppCrashToWeb(crashReport);
				Timer timer = new Timer();
	    		TimerTask task = new TimerTask() {
	    			@Override
	    			public void run() {
	    				restartApplication();
	    			}
	    		};
	    		timer.schedule(task, 500 * 1);
				Looper.loop();
			}

		}.start();
        return true;  
    }  
    
    private void sendAppCrashToWeb(String crashReport) {
    	new CommonRequest(mContext, new Handler()).sendCrashLog(crashReport);
	}
      
    /** 
     * 收集设备参数信息 
     * @param ctx 
     */  
    public void collectDeviceInfo(Context ctx) {  
        try {  
            PackageManager pm = ctx.getPackageManager();  
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);  
            if (pi != null) {  
                String versionName = pi.versionName == null ? "null" : pi.versionName;  
                String versionCode = pi.versionCode + "";  
                infos.put("versionName", versionName);  
                infos.put("versionCode", versionCode);  
            }  
        } catch (NameNotFoundException e) {  
            Log.e(TAG, "an error occured when collect package info", e);  
        }  
        Field[] fields = Build.class.getDeclaredFields();  
        for (Field field : fields) {  
            try {  
                field.setAccessible(true);  
                infos.put(field.getName(), field.get(null).toString());  
                Log.d(TAG, field.getName() + " : " + field.get(null));  
            } catch (Exception e) {  
                Log.e(TAG, "an error occured when collect crash info", e);  
            }  
        }  
    }  
    
    private String getCrashReport(Context context, Throwable ex) {
		PackageInfo pinfo = getPackageInfo(context);
		StringBuffer exceptionStr = new StringBuffer();
		exceptionStr.append("Version: " + pinfo.versionName + "("
				+ pinfo.versionCode + ")\n");
		exceptionStr.append("Android: " + android.os.Build.VERSION.RELEASE
				+ "(" + android.os.Build.MODEL + ")\n");
		exceptionStr.append("Exception: " + catchCrashMessage(ex) + "\n");
		return exceptionStr.toString();
	}
    
    private PackageInfo getPackageInfo(Context context) {
		PackageInfo info = null;
		try {
			info = context.getPackageManager().getPackageInfo(context.getPackageName(), 0);
		} catch (NameNotFoundException e) {
			 e.printStackTrace(System.err);
		}
		if (info == null)
			info = new PackageInfo();
		return info;
	}
    
    private String catchCrashMessage(Throwable ex) {
		StringBuffer sb = new StringBuffer();
		Map<String, String> infos = new HashMap<String, String>();
		for (Map.Entry<String, String> entry : infos.entrySet()) {
			String key = entry.getKey();
			String value = entry.getValue();
			sb.append(key + "=" + value + "\n");
		}

		Writer writer = new StringWriter();
		PrintWriter printWriter = new PrintWriter(writer);
		ex.printStackTrace(printWriter);
		Throwable cause = ex.getCause();
		while (cause != null) {
			cause.printStackTrace(printWriter);
			cause = cause.getCause();
		}
		printWriter.close();
		String result = writer.toString();
		sb.append(result);
		return sb.toString();
	}
    
    private File save2File(String crashReport) {
		String fileName = "crash-" + DateUtil.getNowTime() + ".txt";
		if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
			try {
				File dir = new File(LConstants.CRASH_PATH);
				if (!dir.exists())
					dir.mkdirs();
				File file = new File(dir, fileName);
				FileOutputStream fos = new FileOutputStream(file);
				fos.write(crashReport.toString().getBytes());
				fos.close();
				return file;
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return null;
	}
    
    /**
     * 异常后重启应用
     */
    private void restartApplication() {
        Intent intent = mContext.getPackageManager().getLaunchIntentForPackage(mContext.getPackageName());
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        mContext.startActivity(intent);
        // 退出
        android.os.Process.killProcess(android.os.Process.myPid());
        System.exit(0);
    }
}  